Some European salamander breeders are using outdoor enclosures, but no one in the US that I know of. It's certainly possible, but hard to comment on without knowing what region you live in, and what sort of species you are interesting in studying. And do you mean an enclosed pond, or a tank? Local native species, or others?
I AM! ive already raised woodfrog tadpoles to little froglets and two spotted salamander larvae, and now im raising green frog tadpoles! its set up as a natural tank, with naturally occuring water plants from new york state. i have arrow arum, narrowleaf arrowhead, some other plant that throws up a huge stem with tiny white flowers, some small emersed/submerged grasses, duckweed, and some other plant that seems to grow emersed, and some algae. i have an airstone supplying fresh oxygen 24/7 if it is needed, and i test the water quality every few days to make sure the plants are doing their business, which they are! its working out great!
Those salamander larvae got fat fast! i would be taking pictures of them and see them lunge and eat something which i didnt even see in the first place. i assumed it was daphnia and other small prey items like mosquito larvae.
Unless you can keep the temperatures outside in optimal newt/salamander ranges, i wouldn't try it.